SU1443184A1 - Device for monitoring communication channel quality - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to improve the accuracy of control. The device contains 1 high frequency, frequency converter 2, 3 low frequencies. The goal is achieved by the fact that two quadrs 4.5, multiplier 6, three integrators 7.9, 11, three ADCs 8d 10.12, r-t clock pulses mt pulses 13, counter t4, driver 15 are entered into the device. signals and the transmitter 16. The monitoring device evaluates the quality of the channel by the ratio of the interference power to the signal power and by the ratio of the noise power to the signal power. Separation of a signal, noise, noise is carried out by means of transformations performed on averaged values, transformed according to certain laws of the input process. Any microcomputer can be used as calculator 16. The proposed device provides a higher accuracy of control for all types of signals and interference, except for amplitude-modulated. 1 il. "

Description

 one

one

The invention relates to communication technology and can be used to control the quality of communication channels with passive and organized interference, as well as with multiplicity of propagation of signals.

The purpose of the invention is to improve the accuracy of control.

The drawing shows the structural scheme of the device.

The device for controlling the communication channel contains a high frequency amplifier 1, a frequency converter 2, a low frequency amplifier 3, the first quad 4, the second quad 5, multiplier 6, the first integrator 7, the first analog-to-q converter (ADC) 8., the second integrator 9, the second analogue is an analogue digital converter (ADC) K), a third integrator 11, a third analog-to-digital converter (ADC) 12, a generator of 13 clock pulses, a counter 14, a driver 15 of the controls: signals and a calculator 16.

The device operates as follows.

An additive mixture of the useful signal, interference and noise is fed to the input of the device. This total signal is amplified by amplifier 1, its carrier frequency is lowered by converter 2, and the signal at lower frequency is again amplified by amplifier 3 to a value sufficient for normal operation of quadrant 4. These transformations, due to their linearity, do not change the ratio between the signal envelopes, noise interference, as well as does not change the distribution of the noise component of the mixture, only shifts the spectrum of the components from: a primary signal. The signal received at the input of the quad 4 can be written as

A-A cos (uj, t + 4 + A cos (w t + ifj) +, where A, A 2 are envelopes; s, H, and UJj,

H

i | j - frequency and phases of the useful signal and interference; - fluctuation noise. After quadrants 4 and 5 of multiplier 6, signals A, A, A are fed to integrators 7.9 and 11, where accumulation takes place for a set time. The outputs from the integrators 7.9 and 11 form signals proportional to the average values of the signals A, A, A. So

as the integration time of signals is the same, we assume that the proportionality coefficient is equal to one. After integrators 7.9 and 11, the signals A, A, A are fed to the inputs of ADC 8, 10 and 12, where the signals A, A A

converted to digital form.

The calculator 16 takes the digitized d GB

The values of the signals A, A, A and calculates the ratio of the interference power to the signal power using the formula

15

R,

2F

a + vaz - 2f

and the noise power to the signal power at pho4) mule

one

a + Va2 - 2F

 one

where F ach - | - (AZ);.

 , - :: 2 g cos (); one

 s

(FOR A)

V arccos - HA - A - 12A2 X

dd

35

Calculation results are provided to the first and second outputs of the device, respectively.

Any microcomputer can be used as calculator 16.

Thus, the proposed device provides higher control accuracy for all types of signals and interference, except for amplitude-modulated.

Form of the invention

A device for monitoring the quality of the communication channel, comprising a series-connected high-frequency amplifier, whose input is the device's input, a frequency converter and a low-frequency amplifier, characterized in that, in order to improve the control accuracy, the first quadrant connected in series, the input of which is connected to output amplifier low frequency, the second quad, multiplier.

the second input of which is connected to the output of the first quadr, the first integrator and the first analog-digital converter are azozagep, the second integrator connected in series, the information input of which is connected to the output of the second quadrant, and the second analog-digital converter connected in series by the third integrator, information the input of which is connected to the output of the first quad, and the third analog-to-digital converter, connected in series to the clock generator.

counter, driver control to dikh signals, the first output of which is connected to the control inputs of all analog-to-digital converters, the second output is connected to the control inputs of all integrators, and the third output to the inputs of the zero signal of all integrators, and the calculator, first, second and third the inputs of which are connected to the outputs of the first, second and third analog digital signal converters, respectively, and the first and second outputs are the first and second outputs of the device.

Claims (1)

Claim A device for monitoring the quality of a communication channel containing a series-connected high-frequency amplifier, the input of which is the input of the device, a frequency converter and a low-frequency amplifier, characterized in that, in order to improve the control accuracy, a first quadrator is connected in series, the input of which is connected to the output of the amplifier low frequency, a second quadrator, a multiplier, the second input of which is connected to the output of the first quadrator, the first integrator and the first analog-to-digital converter, pos connected to the second integrator, the information input of which is connected to the output, the house of the second quadrator, and the second analog-to-digital converter, connected in series to the third integrator, the information input of which is connected to the output of the first quadrator, and the third ^ analog-to-digital converter, connected in series clock generator, .15 counter, control signal generator, the first output of which is connected to the control inputs of all analog-to-digital converters, the second output is connected is connected to the control inputs of all integrators, and the third output is to the inputs of the zeroing signal of all integrators, and the calculator, the first, second, and third inputs of which are connected to the outputs of the first, second, and third analog-to-digital converters, respectively, and the first and second outputs are the first and second outputs of the device.